Sealed Battery Pack Assembly for Waterproof Power Tool Mounting
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Solution Overview
Problem
Existing battery packs for pressurized cleaning devices are not adequately sealed, leading to safety hazards such as short circuits, electrical leakage, and potential cell explosions due to water ingress during use.
Innovation Solution
A power tool assembly with a battery pack that includes a plug socket seal member and an upper-lower housing body seal member to prevent external water from entering the mounting cavity, combined with a locking apparatus isolated outside the mounting cavity, ensuring comprehensive sealing without altering the battery pack's structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional battery pack design is used without additional sealing measures, then the structure remains simple and cost-effective, but water ingress occurs leading to short circuits and safety hazards
Solution Approach 1:
The sealing structure is divided into multiple independent components: a first sealing member positioned at the fitting gap between power tool and battery pack, and a second sealing member positioned at the assembly gap between upper and lower housing bodies. Each sealing member addresses specific sealing requirements independently, achieving comprehensive waterproofing without requiring a completely redesigned complex sealing system.
Solution Approach 2:
Sealing members are introduced as intermediary elements between different components (power tool housing and battery pack housing, upper and lower housing bodies) to prevent water ingress. These sealing members act as mediators that block water pathways without requiring fundamental changes to the existing battery pack structure, maintaining simplicity while improving reliability.
2Reliability
If the locking apparatus is positioned inside the mounting cavity, then the structure is compact, but water can enter the cavity through the locking mechanism
Solution Approach 1:
The locking apparatus is extracted from the mounting cavity and repositioned on the outer surface of the battery pack housing. This extraction removes the water ingress pathway that would exist if the locking mechanism remained inside the cavity, preventing water from entering through the locking mechanism while maintaining a compact overall design.
Solution Approach 2:
The locking apparatus is positioned on the outer surface to preemptively prevent water from reaching the mounting cavity through the locking mechanism. By placing the locking apparatus outside the cavity, the design proactively blocks a potential water ingress route before water can penetrate into the internal cavity, ensuring waterproof performance without increasing volume.
Data Source
AI summary
Embodiments of the present disclosure relate to a power tool assembly, including a tool body and a battery pack. The battery pack includes: an accommodated cell unit, a battery pack electrode base, a mounting cavity, and a locking apparatus. At least one of a power tool and the battery pack is configured with a plug socket seal member. The battery pack further includes an upper-lower housing body seal member disposed at a connection between an upper housing body and a lower housing body. When the upper housing body is coupled to the lower housing body, the upper-lower housing body seal member blocks communication between the outside and the mounting cavity. The locking apparatus is mounted on a battery pack housing, and the locking apparatus is isolated outside the mounting cavity.